Concrete mixer and conveyer



Feb. 21,1928. 1,659,750

J. STOLLINGS CONCRETE MIXER AND CONVEYER Filed Sept. 25. 1926 2Sheets-Sheet 1 fiave'nzior.

JE Z SELL/4 6$ attorney.

Feb. 21, 1928. 1,659,750

J. L. STOLLINGS CONCRETE MiXER AND CONVEYER Filed Sept. 25. 1926 2Sheets-Shet 2 Even tor. (258551 S'EAi/A/G Wgaim w i I afm'neg,

Patented Feb, 211,

uarran stares JESSE 1L. S'I'OLLINGS,.0F LOS B AZNOS, CAiLIFOBINIA.

oononn'rn MIXER AND CONVEYER.

Application filed September 25, 1926. Serial No. 137,768.

This invention relates to improvements in concrete mixers andconveyersand has par ticular reference to a concrete mixer adapted to betransported from place to place, particularly over a railroad track.

Another object of this invention is to provide a mechanism which willmix the materials placed therein during the period of travel from thepoint of filling to the point of discharge. 7

A further object is to produce'a device of this character which issimple in construction, easy to operate andone which may be manufacturedat aminimum cost.

A further object is to produce a mixer which may. be employed intransporting large quantities of concrete a considerable distance, andto discharge the same without the employment of complicated machinery.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawings forming a part'of this specification, andin which like numerals are employed to designate like parts throughoutthe same,

Figure 1 is a side elevation of my improved mixer,

Figure 2 is a top plan view of Figure 1, Figure 3 is an end elevationtaken on the line 3-3 of Figure 2,

Figure 4 'is an end elevation taken from the opposite end to that shownin Figure 3, Figure 5 is a fragmentary detail view showing the water andair connection to the trunnion,

Figure 6 is a fragmentary detail View I showing the position of theflushing pipe in the mixing chamber, and

Figure 7 is a cross-section taken on the line 77 of FigureG. v

In the mixing of concrete, it has been common to mix the concrete at adistance and to convey the same to the point of use in a vehicle of thedumping type. In railroad work, and particularly in tunnel constructionit has been common to mix the concrete, load the same upon fiat cars andhaul it into the tunnel from which point it was placed in the forms. Theresult of this practise is that considerable time is lost intheconveying as well as the expense of holding the train up in thetunnel.

It is the object of my invention to place the raw materials in a mixingchamber and then to convey this mixing chamber to the point where theconcrete is to be used and to cause the mixing of the raw materialsduring the period of conveyance.

I further propose to provide means where by the mixing chamber may betilted when the point of delivery has been reached thereby allowing thematerial to fall by gravity from the chamber, after which time themixing chamber may be returned for its next load.

In accomplishing this object, I employ a substantially rectangular frame5 which is mounted upon wheels 6 and 7. In the pres ent instance, thesewheels travel upon a railroad track 8. Positioned upon the frame 5 arejournal blocks 9 and 11 which carry trunnions 12 and 13. which trunnionsare secured to'a frame 14, which frame is substantially rectangular inshape and within which is journaled a mixing chamber 16.

At 17 and 18 I have shown bearings which support stub shafts connectedto the ends of the mixing chamber 16. This construction permits themixing chamber 16 to be rotated within the rectangular frame 14.

In order to accomplish this rotat.ion, I have provided a gear 19 upon.the outer circumference of the mixing chamber. This gear meshes with agear 21 freely rotatable upon a shaft 22 supported below the rectangularframe 5.

A clutch is shown at 23 which clutch is keyed to the shaft 22 and may bemoved through the medium of a handle 24 moving over a quadrant 26.

A gear 27 mounted, upon the shaft 22 meshes with a gear 28 carried uponthe axle 29. which axle rotates with the wheels 6.

Entrance to the chamber 16 is gained through a hatch 31, while a similarhatch 32 provided at the opposite end of the mixing chamber providesmeans for emptying the same. these hatches may be sealed while themixing operation is in progress.

- At 33 I have shown an elevating cylinder pivoted in bearings '34 and36 carried upon a supplemental frame 37 secured to the frame 5. A pistonwithin the cylinder 33 is connectedto a piston rod 38 which is in turnpivoted as at 39 to the bearings 18.

Referring now to Figure 5, it will be noted that a pipe is indicatedat41 which pipe is connected to a yoke 42 and that a three-way valve 43 ispositioned within theyoke.

It is of course understood that i Pipes 44 and 46 extend from the yoke42 Q and enter the bearing 18. Ports 47 and 48,

respectively, connect with annular grooves b'ottomof the mixing shaft 16and is perforated so that fluid discharged therein will be dischargedtherefrom in jets as indicated by the arrows in Figure 7, while the pipe54 extends upwardly and ends in a nozzle-like aperture.

The result of this construction is that concrete materials may be placedwithin the mixing chamber by introducing the same through the hatch 31,after which water is introduced through the pipe 4l,'discharged throughthe pipe 55 or the pipe 54 until suffivcient water is in the batch tomake a strong mixture.

Assuming now that the. frame having my device connected thereto proceedsto the point'where the concrete is to be used the operation will be asfollows Assuming that the handle 24 has been moved so that the clutch 23causes the gear 21 to revolve theresult will be that the mix ing chamber16 will be rotated as long as the wheels 6 are in motion. Should thedistance be great, it may be possible that the handle 24 will bedisengaged throughout a portion of the travel of the frame. Whenarriving at the point of discharge, the hatch 32 will be opened afterwhich air will be admitted to the cylinder 33 at a point below thepiston positioned therein, with the result that the entire mixingchamber and frame 14 will be elevzitedto the dotted line position ofFigure When the chamber has reached the elevated position, the three-wayvalve 43 will be turned in such a manner as to admit compressed air fromthe train line or any other suitable source of supply, into the pipe 54.This compressed air will serve to discharge the mixture within thechamber andshould it be desired to flush the chamber, the valve 43' maybe turned to that position which will discharge the water through thepipe 41 into the pipe thereby flushing the entire interior of thetank.

It will thus be seen that I have devised a concrete mixer and conveyorwhich will minimize the amount of labor now employed in the mixing andconveying of concrete, particularly in railroad work.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes relative to the material, size, shape and arrangementofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claim.

Having thus described my invention, I claim In a concrete mixer, thecombination with a frame, a rotary mixing chamber positioned within saidframe, trunnions carried on said mixing chamber, bearings positioned onsaid frame and adapted to receive said trunnions, ports formed in saidbearings, grooves formed in one of said trunnions and in com municationwith said ports, pipes communicating with said grooves, one of the saidpipes extending to a point within the upper portion ofsaid mixingchamber, the other of said pipes extending to a point parallel with thebottom of said mixing chamber for the purpose specified.

. In testimony whereof I afiix my signature.

JESSE L. STOLLINGS.

